Ladder



LADDER.

Pate'ntedApr. 27, 1891.

D. HUNT.

(No Model.)

No. 581,348. F'IEJL INVEN-r-EJR QMJM EMM UNITED STATES ATENT Fries.

DAVID HUNT, OF BOSTON, MASSACHUSETTS.

LADDER.

SPECIFICATION forming part of Letters Patent No. 581,348, dated April27, 1897. Application filed January 6, 1896- Rerlewell September 30,1896l Serial No. 607,500. (No model.)

To @ZZ whom t may concern.:

Be it known that I, DAVID HUNT, of Boston, county of Suffolk, and Stateof Massachusetts, have invented an Improvement in Ladders, of which thefollowing deseri ption, in connection with the accompanying drawings, isa speciication, like letters and figures on the drawings representinglike parts.

This invention has for its object to construct a very light andserviceable yet strong and durable ladder, and the invention hasparticular reference to the construction of the rounds of the ladder.

In accordance with this invention the round is made of Wood or someequivalent material, and to reinforce it it is inclosed within orembraced by wires running longitudinally thereof, which may be madestraight or bent spirally or otherwise formed. There may be several ofthese wires, if desired. In case a collapsible ladder is to be madethese rounds are pivotally connected to the side strips, and in suchcase the wires are bent to form eyes or pivot-holes for the pivot-pins.

p When making a collapsible ladder, I may make the two side strips ofhalf-round material, so that when collapsed the rounds will be inclosedwithin the space formed within and between said side strips.

Figure l shows in front elevation a ladder made collapsible and havingrounds embodying this invention; Fig. 2, a detail of one of the roundsinclosed in or embraced by the wires embodying this invention; Fig. 3, adetail of the wire shown in Fig. 2; Fig. 4, a de-l tail of a roundhaving a wire wound thereon spirally, yet extending lengthwise theround; Fig. 5, a detail of one of the wires shown in Fig. 4, and Fig. Ga cross-section of one of the side strips and a portion of a round.

The round ci (see Figs. 2 and 3) has formed eXteriorly upon each sideand running lengthwise a groove,which extends from end to end of theround, and this groove is also preferably carried transversely acrossthe ends, connecting the two side grooves. Awire of suitable length isbent to form two arms h b' of a length corresponding to the length ofthe round, said wire having formed at the middle an eye b2 and havingformed at each end an eye h3. This wire (shown in Fig. 3) is then causedto embrace the round, being seated in the groove formed exteriorlythereon, and to secure it in place pins2pass through the ends of therounds and through the eye. The rounds made in this way are very strongand durable and may be made very light. The rounds thus constructed maybe rigidly secured to the side strips of the ladder by means of the pins2, but herein I have represented a collapsible ladder composed of twohalf! round side strips c e', and the pins which pass through the endsof lthe rounds and serve to secure the wire in place thereon may serveas pivot-pins, being extended and passed through the side strips. Such acollapsible ladder will be very light and serviceable.

In Figs. 2 and 3 the wire is made quite straight fromend to end, but inFigs. 4 and 5 I have represented the round as having formed eXteriorlyupon it spiral grooves eX- tending from end to end, and the wire will bebent spirally, as shown in Fig. 5, and adapted to enter said groove, ithaving formed at each end an eye. Two such Wires may be utilized withgood effect. Therefore I do not desire to limit my invention to anynumber of wires that I may use or to the particular way that they may beconnected to or caused to embrace the round.

I claiml. In a ladder, the combination of the side strips and roundsconnected thereto, each round consisting of a strip of wood and wiresembracing it longitudinally, and provided at the ends with eyes whichreceive pivot-pins to connect the rounds with the side strips,

substantially as described.

2. In a ladder, the combination of the side strips and rounds, eachround having a groove formed exteriorly upon it, and a binding-wireseated in said groove, and means for connecting said wire at the ends ofthe rounds to the side pieces, thereby connecting the rounds thereto,substantially as described.

3. In a ladder, the combination of the side strips and rounds, eachround having longitudinal grooves formed exteriorly upon it, and a Wirebent to embrace said round, seated in said longitudinal grooves, andhaving eyes formed at its ends and middle, and pins passing through saideyes to connect the rounds thereto, substantially as described.

4. In a ladder, the combination of half- IOO round side strips c, c',and rounds connected name to this specification in the presence ofthereto, each round consisting of a strip of two subscribing Witnesses.Wood, and Wires embracing it longitudinally, Y T Y f and provided at theends with eyes which re- DAX ID HUN l' eeive pivot-pins to eonneet therounds With lVitnesses: the side strips, substantially as described. F.Il. DAVIS,

In testimony whereof l lla-ve signed my A B. J. NOYES.

